C操作xml文件入門

1、已知有一個(gè)XML文件（bookstore.xml）如下：<?xml version="1.0" encoding="gb2312"?><bookstore><book genre="fantasy" ISBN="2-3631-4"><title>Oberon's Legacy</title><author>Corets, Eva</author><price>5.95</price></book

2、></bookstore>1、往<bookstore>節(jié)點(diǎn)中插入一個(gè)<book>節(jié)點(diǎn)：XmlDocument xmlDoc=new XmlDocument();xmlDoc.Load("bookstore.xml");XmlNode root=xmlDoc.SelectSingleNode("bookstore");/查找<bookstore>XmlElement xe1=xmlDoc.CreateElement("book");/創(chuàng)建一個(gè)<book>節(jié)點(diǎn)xe1.Set

3、Attribute("genre","李贊紅");/設(shè)置該節(jié)點(diǎn)genre屬性xe1.SetAttribute("ISBN","2-3631-4");/設(shè)置該節(jié)點(diǎn)ISBN屬性XmlElement xesub1=xmlDoc.CreateElement("title");xesub1.InnerText="CS從入門到精通"/設(shè)置文本節(jié)點(diǎn)xe1.AppendChild(xesub1);/添加到<book>節(jié)點(diǎn)中XmlElement xesub2=xmlDoc.Crea

4、teElement("author");xesub2.InnerText="候捷"xe1.AppendChild(xesub2);XmlElement xesub3=xmlDoc.CreateElement("price");xesub3.InnerText="58.3"xe1.AppendChild(xesub3);root.AppendChild(xe1);/添加到<bookstore>節(jié)點(diǎn)中xmlDoc.Save("bookstore.xml");/=結(jié)果為： <

5、;?xml version="1.0" encoding="gb2312"?><bookstore><book genre="fantasy" ISBN="2-3631-4"><title>Oberon's Legacy</title><author>Corets, Eva</author><price>5.95</price></book><book genre="李贊紅&qu

6、ot; ISBN="2-3631-4"><title>CS從入門到精通</title><author>候捷</author><price>58.3</price></book></bookstore>  2、修改節(jié)點(diǎn)：將genre屬性值為“李贊紅“的節(jié)點(diǎn)的genre值改為“update李贊紅”，將該節(jié)點(diǎn)的子節(jié)點(diǎn)<author>的文本修改為“亞勝”。XmlNodeList nodeList=xmlDoc.SelectSingleNode(&qu

7、ot;bookstore").ChildNodes;/獲取bookstore節(jié)點(diǎn)的所有子節(jié)點(diǎn)foreach(XmlNode xn in nodeList)/遍歷所有子節(jié)點(diǎn)XmlElement xe=(XmlElement)xn;/將子節(jié)點(diǎn)類型轉(zhuǎn)換為XmlElement類型if(xe.GetAttribute("genre")="李贊紅")/如果genre屬性值為“李贊紅”xe.SetAttribute("genre","update李贊紅");/則修改該屬性為“update李贊紅”XmlNodeList

8、nls=xe.ChildNodes;/繼續(xù)獲取xe子節(jié)點(diǎn)的所有子節(jié)點(diǎn)foreach(XmlNode xn1 in nls)/遍歷XmlElement xe2=(XmlElement)xn1;/轉(zhuǎn)換類型if(xe2.Name="author")/如果找到xe2.InnerText="亞勝"/則修改break;/找到退出來就可以了break;xmlDoc.Save("bookstore.xml");/保存。 /=最后結(jié)果為：<?xml version="1.0" encoding="gb231

9、2"?><bookstore><book genre="fantasy" ISBN="2-3631-4"><title>Oberon's Legacy</title><author>Corets, Eva</author><price>5.95</price></book><book genre="update李贊紅" ISBN="2-3631-4"><title&g

10、t;CS從入門到精通</title><author>亞勝</author><price>58.3</price></book></bookstore> 3、刪除 <book genre="fantasy" ISBN="2-3631-4">節(jié)點(diǎn)的genre屬性，刪除 <book genre="update李贊紅" ISBN="2-3631-4">節(jié)點(diǎn)。XmlNodeList xnl=xmlDoc.Se

11、lectSingleNode("bookstore").ChildNodes;foreach(XmlNode xn in xnl)XmlElement xe=(XmlElement)xn;if(xe.GetAttribute("genre")="fantasy")xe.RemoveAttribute("genre");/刪除genre屬性else if(xe.GetAttribute("genre")="update李贊紅")xe.RemoveAll();/刪除該節(jié)點(diǎn)的全部內(nèi)

12、容xmlDoc.Save("bookstore.xml");/=最后結(jié)果為：<?xml version="1.0" encoding="gb2312"?><bookstore><book ISBN="2-3631-4"><title>Oberon's Legacy</title><author>Corets, Eva</author><price>5.95</price></book><book></book></bookstore> 4、顯示所有數(shù)據(jù)。XmlNode xn=xmlDoc.SelectSingleNode("bookstore");XmlNodeList xnl=xn.ChildNodes;foreach(XmlNode xnf in xnl)XmlElement xe=(XmlElement)xnf;Console.Writ